/*
 * This file is part of Applied Energistics 2. Copyright (c) 2013 - 2015, AlgorithmX2, All rights reserved. Applied
 * Energistics 2 is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General
 * Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
 * later version. Applied Energistics 2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
 * Public License for more details. You should have received a copy of the GNU Lesser General Public License along with
 * Applied Energistics 2. If not, see <http://www.gnu.org/licenses/lgpl>.
 */

package appeng.services.compass;

import java.io.File;
import java.util.HashMap;
import java.util.Map;

import javax.annotation.Nonnull;

import com.google.common.base.Preconditions;

public final class CompassReader {

    private final Map<Long, CompassRegion> regions = new HashMap<>(100);
    private final int dimensionId;
    private final File worldCompassFolder;

    public CompassReader(final int dimensionId, @Nonnull final File worldCompassFolder) {
        Preconditions.checkNotNull(worldCompassFolder);
        Preconditions.checkArgument(worldCompassFolder.isDirectory());

        this.dimensionId = dimensionId;
        this.worldCompassFolder = worldCompassFolder;
    }

    public void close() {
        for (final CompassRegion r : this.regions.values()) {
            r.close();
        }

        this.regions.clear();
    }

    public void setHasBeacon(final int cx, final int cz, final int cdy, final boolean hasBeacon) {
        final CompassRegion r = this.getRegion(cx, cz);

        r.setHasBeacon(cx, cz, cdy, hasBeacon);
    }

    public boolean hasBeacon(final int cx, final int cz) {
        final CompassRegion r = this.getRegion(cx, cz);

        return r.hasBeacon(cx, cz);
    }

    private CompassRegion getRegion(final int cx, final int cz) {
        long pos = cx >> 10;
        pos <<= 32;
        pos |= (cz >> 10);

        CompassRegion cr = this.regions.get(pos);

        if (cr == null) {
            cr = new CompassRegion(cx, cz, this.dimensionId, this.worldCompassFolder);
            this.regions.put(pos, cr);
        }

        return cr;
    }
}
